Technical Earthquakes

Sandy

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Yes Oz does have a history of tsunami's @Kino.
You may remember from a post I did on WZ about a 'tsunami' like event that swept through/around Philip Island many years ago. If I remember correctly it was about 20 years ago. We were walking on the beach at Cowes and a rush of water came sweeping around the region and washed up against the blue stone walls, nearly washing one of my sons into the water around the pier. I had to grab him and get him to the steps on the beach wall. It scared the tripe out of us and in all my time on the island, I had never seen that happen before [in my 50+ years]. You could actually see the wall/line of water [probably under a metre high] sweeping around the island towards us.

I also meant to mention that I saw an asteroid crossing over Vic to the west on December 26th 2004. Some believe that an asteroid caused the horrific tsunami on the NE Indian Ocean. Some feel it was an earthquake. I have an open mind and am not sure one way or the other.......bless all those poor folks who lost their lives in that tragic event.
I meant to also add that that 'thing' I saw on 26th December 2004 is what is classed [apparently] as a grey asteroid/meteor. The following link pictures exactly what I saw from Chelsea Beach [Vic.] at 11am [Melbourne time]. This image is on Pinterest and is the top left image on the page link. https://www.pinterest.com.au/pin/679128818786635950/
It was an incredible site and a few of us [strangers to each other] turned and looked at each other with blank faces, wondering where it was heading at the time. It's trajectory, heading WNW, may have contradicted the direction of the 2004 tsunami effect on the coasts, but I can't confirm such.
Cheers again Duck.
As I understand from what you're saying, the object you saw was not bright, but smoking grey, like in the linked photo?
Then it was not a large meteor or small asteroid.
Or, if an object entering the Earth's atmosphere was travelling slowly enough not to glow(unlikely), then any collision with the Earth would be low velocity, low energy and it would not be generating a large tsunami, like the one on 26th Dec 2004.
 
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Duckweather

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As I understand from what you're saying, the object you saw was not bright, but smoking grey, like in the linked photo?
Then it was not a large meteor or small asteroid.
Or, if an object entering the Earth's atmosphere was travelling slowly enough not the glow(unlikely), then any collision with the Earth would be low velocity, low energy and it would not be generating a large tsunami, like the one on 26th Dec 2004.
Curious...what do you think it may have been? It was coughing out a large diameter smoke trail and hoofing along and certainly something that caught the worried eye of those who looked up to see it on that day. Another was recorded [trying to find the source on the net] travelling from the southern pole region going north up the Indian Ocean. I knew that my mentioning of this sighting of mine could cause an 'interest' of sorts, but it will 'stick' with me for the rest of my life. It was eye-opening and fascinating at the same time. Wish I had a video camera with me at the time. ;) As I said, I maintain an open mind when it comes to this sort of phenomena [meteorites, comets and asteroids that is] and it fascinates me.
 
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Colin Maitland

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Email this morning. Not sure which one is the current EQ thread. I am just going off knowing Duckweathers page on WZ. As I have mentioned before on WZ I had to reset the M due to the amount of notifications flooding in. I reset my notifications to 6M+, and over the last couple of years I am started to get that many notifications in my email from USGS. Another this morning.
E1F45205-8C1C-486E-A5A1-44C82CF628F2.png
 

Colin Maitland

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Where I live in Brisbane I am approx 5K from Moreton Bay. Fortunately I am on a hill 50 meters above sea level. I have had this discussion with a few before about the impact of a Tsunami hitting of the coast. Only one other family knew that they would be in trouble as they are only 5 M above sea level on the flats of the suburb. The rest had this false understanding that Moreton Island and Stradbroke Island would save us. I tried to explain the funnel effect to them a few years back. I received an EWN on my phone about 8 years ago of a possible Tsunami and they all said we will be right. Will fortunately this article appeared a few days ago on the ABC and it did the job. They have re-evaluated their plans.

Queensland tsunami modelling shows how coastal communities will be impacted
https://www.abc.net.au/news/2019-07-27/queensland-tsunami-modelling/11330678
 

Sandy

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Where I live in Brisbane I am approx 5K from Moreton Bay. Fortunately I am on a hill 50 meters above sea level. I have had this discussion with a few before about the impact of a Tsunami hitting of the coast. Only one other family knew that they would be in trouble as they are only 5 M above sea level on the flats of the suburb. The rest had this false understanding that Moreton Island and Stradbroke Island would save us. I tried to explain the funnel effect to them a few years back. I received an EWN on my phone about 8 years ago of a possible Tsunami and they all said we will be right. Will fortunately this article appeared a few days ago on the ABC and it did the job. They have re-evaluated their plans.

Queensland tsunami modelling shows how coastal communities will be impacted
https://www.abc.net.au/news/2019-07-27/queensland-tsunami-modelling/11330678
That animation does, however, show that Moreton Island and Stradbroke Island do protect the coast to some extent.
i.e. Animation shows a 1.5m tsunami from the east is blocked and diffracts around and into the main coastal area of Brisbane. North Stradbroke Island appears to be hit with a tsunami run up of about 6m, and Redcliffe peaks about 1m, because it's a focal point. The rest of Brisbane looks like around 0.5m max.

If you scale that up to the Japanese 2011 tsunami (6m nominal), you might expect about 1.5-2m(maybe 4m at Redcliffe) in Brisbane area behind Moreton Island and Stradbroke Island. If from that direction (due east) to threaten 5m above sea level in the main part of Brisbane, the tsunami may need to be perhaps 8m.

Funneling and focusing require more specific topography.
e.g.Onagawa, Japan. March 11 2011. Max Tsunami run up ~24m
Onagawa Tsunami2.jpg
 

StormyLee

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Broome FB community page has people reporting feeling another quake at 7.03am local time - just checked Earthquakes@GA and it's come up as a 4.8. That little spot just keeps on rumbling on doesn't it...! I wonder if that magnitude will be revised over the next couple of hours - I've read that they automatically scale down the magnitudes by 0.5 until proper verification can be done? Would love some more info if the intelligent beings on here could clarify o_O:thumbs:

M4.8.JPG
 

Sandy

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Broome FB community page has people reporting feeling another quake at 7.03am local time - just checked Earthquakes@GA and it's come up as a 4.8. That little spot just keeps on rumbling on doesn't it...! I wonder if that magnitude will be revised over the next couple of hours - I've read that they automatically scale down the magnitudes by 0.5 until proper verification can be done? Would love some more info if the intelligent beings on here could clarify o_O:thumbs:

M4.8.JPG

Generally speaking, if you get a M7, you can expect aftershocks: 1-2 M6, 8-10 M5, maybe 20-30 M4, over a few weeks.
If it's an initial M8, then the same general pattern applies, but all of them are bumped up by one full Magnitude.

However, there is sometimes a pre-shock before the main one.
 
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StormyLee

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Generally speaking, if you get a M7, you can expect aftershocks: 1-2 M6, 8-10 M5, maybe 20-30 M4, over a few weeks.
If it's an initial M8, then the same general pattern applies, but all of them are bumped up by one full Magnitude.

However, there is sometimes a pre-shock before the main one.

Cheers Sandy - interesting!
 

Duckweather

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Jul 8, 2019
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Hi finally again folks. Didn't realize how long it has been since my last post :whistle:

Anyway, the locations that have been on my radar in recent times have been and some still are Chile, north of Australia [Indonesia], Oklahoma, west coast of Canada and the U.S., the St Lawrence waterway [Canada/U.S. border], Australian states and territories, Japan, Antarctica [recent discovery of a magma pool near South Sandwich islands, which I have suspected was there for many, many years - and I think there is another one to be discovered in Antarctica soon], the 'ear' in the Pacific, Alaskan Gulf.... to name a few.
There will, as I always say, quakes and tremors which regularly come up in several locations, for example California and parts of Alaska. So to predict movements in those locations is quite easy and one can't claim a 'hit' when these regular tremors come up. A good prediction [I don't like that word - I prefer to say I have a 'feeling' when a larger or moderate quake may come up] is when a larger or moderate quake comes up in a region and the location is almost pin-pointed in general or exact timing and place. This can be difficult to do. Sometimes I am correct with such; other times I am almost right and other times I can be wrong.

The Ridgecrest quakes have formed a large crevice east of the mountain ranges which roughly corresponds with the direction [somewhat parallel[ with the mountains and San Andreas [which is on the west of the mountain ranges] - very interesting. It almost looks like the land mass to the west. along with the mountain ranges has moved slightly NNW from the rest of the continent on the east.

That large quake in Indonesia yesterday may have been felt in varying degrees over many parts of our continent. Various reports to Geoscience Australia filtered in to that site after the quake. We heard a roar [like a thunder rumble which lasted about 5 second] here, as did some other folks in Vic - but others didn't. Associated with this was a slight rattle - very small - in nearby windows. Still waiting to see of Geoscience registered this as a tremor.

Anyway, more tremors will come up in locations I haven't mentioned and some will in the locations I have rattled on about. Mother Earth is never asleep.

Cheers for now, Duck.
 
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Sandy

Dark Sith Lord of the Pool Room
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You might say that the expectation of quakes in different parts of the world is also dependent on how many happen....

It may be surprising to know that the number of quakes M6.0 or higher this year is around 90!!! That's one every 57 hours!!!!

And there's been nine M7.0 or higher, and one M8.0

Without checking, my guess would be that there's been maybe > 1500 x M5.0 to M5.9 quakes so far this year. I've felt maybe 5 of those.

The Earth is never quiet.
 

Sandy

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Yeah I saw that before posting. Hopefully no damage. You must get jolted around a fair bit over there.

350km away at only M6.3 means no damage here.
After 2011, I got so used to quakes, that I can usually tell approx magnitude and distance.
Duration tells me magnitude, and shaking tells me distance.
Oh, and the ones closer than maybe 60km, start with a big jolt or "bump". ;)
 

Colin Maitland

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M6.0 Earthquake - Santa Cruz Islands
Preliminary Report
Magnitude 6.0
Date-Time
  • 20 Aug 2019 13:03:54 UTC
  • 21 Aug 2019 00:03:54 near epicenter
  • 20 Aug 2019 23:03:54 standard time in your timezone
Location 11.410S 166.287E
Depth 53 km
Distances
  • 92.8 km (57.5 mi) SE of Lata, Solomon Islands
  • 464.4 km (288.0 mi) NNW of Luganville, Vanuatu
  • 727.5 km (451.0 mi) ESE of Honiara, Solomon Islands
  • 733.2 km (454.6 mi) NNW of Port-Vila, Vanuatu
  • 1057.2 km (655.5 mi) N of W�, New Caledonia
Location Uncertainty Horizontal: 6.6 km; Vertical 5.8 km
Parameters Nph = 88; Dmin = 457.0 km; Rmss = 0.98 seconds; Gp = 42°
Version =
Event ID us 600057ee
For updates, maps, and technical information
see: Event Page or USGS Earthquake Hazards Program
National Earthquake Information Center
U.S. Geological Survey
 

Colin Maitland

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M6.0 Earthquake - western Indian-Antarctic Ridge
Preliminary Report
Magnitude 6.0
Date-Time
  • 21 Aug 2019 14:28:26 UTC
  • 21 Aug 2019 23:28:26 near epicenter
  • 22 Aug 2019 00:28:26 standard time in your timezone
Location 50.320S 139.256E
Depth 10 km
Distances
  • 987.1 km (612.0 mi) SW of Geeveston, Australia
  • 1021.5 km (633.3 mi) SW of Kingston, Australia
  • 1030.0 km (638.6 mi) SW of Sandy Bay, Australia
  • 1031.6 km (639.6 mi) SW of Hobart, Australia
  • 1033.4 km (640.7 mi) SW of Glenorchy, Australia
Location Uncertainty Horizontal: 10.7 km; Vertical 1.9 km
Parameters Nph = 60; Dmin = 1029.0 km; Rmss = 1.00 seconds; Gp = 67°
Version =
Event ID us 600057xt
For updates, maps, and technical information
see: Event Page or USGS Earthquake Hazards Program
National Earthquake Information Center
U.S. Geological Survey
 

Colin Maitland

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M6.0 Earthquake - Vanuatu
Preliminary Report
Magnitude 6.0
Date-Time
  • 24 Aug 2019 15:51:27 UTC
  • 25 Aug 2019 02:51:27 near epicenter
  • 25 Aug 2019 01:51:27 standard time in your timezone
Location 14.320S 167.175E
Depth 114 km
Distances
  • 63.8 km (39.5 mi) SW of Sola, Vanuatu
  • 132.8 km (82.3 mi) N of Luganville, Vanuatu
  • 397.2 km (246.3 mi) NNW of Port-Vila, Vanuatu
  • 730.2 km (452.7 mi) N of W�, New Caledonia
  • 868.9 km (538.7 mi) N of Pa�ta, New Caledonia
Location Uncertainty Horizontal: 9.7 km; Vertical 6.8 km
Parameters Nph = 62; Dmin = 124.7 km; Rmss = 0.99 seconds; Gp = 54°
Version =
Event ID us 700057v4
For updates, maps, and technical information
see: Event Page or USGS Earthquake Hazards Program
 

Colin Maitland

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Jul 4, 2019
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Bracken Ridge
M6.3 Earthquake - off the coast of Oregon
Preliminary Report
Magnitude 6.3
Date-Time
  • 29 Aug 2019 15:07:58 UTC
  • 29 Aug 2019 06:07:58 near epicenter
  • 30 Aug 2019 01:07:58 standard time in your timezone
Location 43.567N 127.865W
Depth 5 km
Distances
  • 284.6 km (176.5 mi) W of Bandon, Oregon
  • 295.9 km (183.5 mi) W of Coos Bay, Oregon
  • 327.4 km (203.0 mi) WSW of Newport, Oregon
  • 368.5 km (228.5 mi) W of Roseburg, Oregon
  • 414.8 km (257.2 mi) WSW of Salem, Oregon
Location Uncertainty Horizontal: 6.9 km; Vertical 3.5 km
Parameters Nph = 175; Dmin = 297.1 km; Rmss = 1.26 seconds; Gp = 88°
Version =
Event ID us 700059qh
For updates, maps, and technical information
see: Event Page or USGS Earthquake Hazards Program
 

Colin Maitland

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Jul 4, 2019
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Bracken Ridge
M6.7 Earthquake - Fiji region
Preliminary Report
Magnitude 6.7
Date-Time
  • 1 Sep 2019 15:54:22 UTC
  • 2 Sep 2019 03:54:22 near epicenter
  • 2 Sep 2019 01:54:22 standard time in your timezone
Location 20.420S 178.544W
Depth 615 km
Distances
  • 344.2 km (213.4 mi) SE of Levuka, Fiji
  • 357.0 km (221.3 mi) WNW of Nuku�alofa, Tonga
  • 405.0 km (251.1 mi) SE of Suva, Fiji
  • 493.5 km (306.0 mi) SSE of Labasa, Fiji
  • 510.5 km (316.5 mi) SE of Ba, Fiji
Location Uncertainty Horizontal: 10.1 km; Vertical 5.4 km
Parameters Nph = 126; Dmin = 464.4 km; Rmss = 1.20 seconds; Gp = 25°
Version =
Event ID us 70005axg
For updates, maps, and technical information
see: Event Page or USGS Earthquake Hazards Program
 
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Flowin

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A bit of activity in NSW today.
Magnitude 4.4 near Denman around 1629 AEDT (0529 UTC),
and an earlier one Magnitude 3.8 near Muswellbrook around 1530 AEDT (0427 UTC)
 
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Tsunami

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Hi Duck and everyone. Long time no see ducky.
Seems the planet has been resonably inavtive this year. Evrn after scientists were calling for a big year.
Ive had an eye on Casscadia subductionzone. Its a monster and hope it doesnt go in our life time. Although its over due
Of interest Nostradamus has predicted Casscadia rupture i 2019. He is quickly running out of time
Lets hope the less active times will keep comming
 

Seabreezes

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South West Rocks, NSW
We had a weak earthquake here tonight at South West Rocks during Christmas dinner. 2.3 on the Richter Scale. The epicenter was about 5kms away from the house. You could hear a rumbling and feel it in the ground for at least five seconds and then a stronger rattle suddenly hit the house shaking the cabinets/shelves, with it then subsiding within a second after that.
Spooked the neighbourhood dogs immediately after it finished too.

https://earthquakes.ga.gov.au/event/ga2019zhxvum
South West Rocks, NSW
Summary
Origin (UTC): 25/12/2019 09:59:37
Epicentral Time: 25/12/2019 20:59:37
Longitude: 153.02
Latitude: -30.84
Magnitude: 2.3 (ML)
Depth: 0 km
Event Id: ga2019zhxvum
Felt: Yes

*************
IDY68009

Australian Government Bureau of Meteorology

MEDIA:
NO USE OF STANDARD EMERGENCY WARNING SIGNAL (SEWS)
PLEASE BROADCAST THIS INFORMATION IF REFERRING TO THE EARTHQUAKE IN NEWS REPORTS.
********************************************************************************

NO TSUNAMI THREAT TO AUSTRALIA
Issued by the Joint Australian Tsunami Warning Centre (JATWC) at 9:31 PM AEDT on
Wednesday 25 December 2019

********************************************************************************
SUMMARY:
The Joint Australian Tsunami Warning Centre has detected an earthquake that has
been reported as being felt near South West Rocks, NSW.

There is NO TSUNAMI THREAT TO THE AUSTRALIAN MAINLAND, ISLANDS OR TERRITORIES.

For further information check the Bureau's website www.bom.gov.au/tsunami or call
1300 TSUNAMI (1300 878 6264).

No further updates will be issued unless the situation changes.
********************************************************************************
DETAILS:
The Joint Australian Tsunami Warning Centre has detected an earthquake that has
been reported as being felt near South West Rocks, NSW. The earthquake of
magnitude 2.3 occurred at 8:59 PM AEDT on Wednesday 25 December 2019 near South
West Rocks, NSW. Based on the magnitude and location of this earthquake, the
JATWC has assessed that there is NO TSUNAMI THREAT TO THE AUSTRALIAN MAINLAND,
ISLANDS OR TERRITORIES from this earthquake.

If you want to contribute to Australia's earthquake data base, please login to
the Geoscience Australia website at:

http://www.ga.gov.au/earthquakes/staticPageController.do?page=felt-earthquake

No further updates will be issued unless the situation changes.

For latest and further information on tsunami warnings, please call 1300 TSUNAMI
(1300 878 626) or visit www.bom.gov.au/tsunami

********************************************************************************
The JATWC is operated by the Australian Bureau of Meteorology and Geoscience
Australia
********************************************************************************

 

ojisan

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Felt some shaking early this morning (i am in Yokohama at the moment)... found out that there was a 5 point something quake in ibaraki around 4.30am..
 

'H' Jones

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I am currently in the Philippines, and yes, a reasonable shake happens pretty often here. Alas, unlike Japan, the infrastructure here is not as well built (huge understatement !).
Hope I am not here if a big one hits.
 

skifree

A disciple of the blessed avi giraffe
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Wow!
Nice response though...immediately sending rescue workers, beds blankets heaters food to safe locations for the displaced.
The Turks have had some practice.
 

Sandy

Dark Sith Lord of the Pool Room
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A few quakes not far from me in Yokohama in the last few days. (tiny movement at my place)
1. 4th May, about 90km NE in Chiba prefecture, M5.5, 10:11pm
2. 4th May, about 140km NE, M4.4, 10:38pm (out at sea, probably triggered by the above)
3. 6th May, about 40km NE in Chiba prefecture, M5.0, 1:57am. This one woke me up. Only 20km from central Tokyo.

The 1st and 3rd registered an earthquake alert on my phone.

It seems to me that this is an up-tick in quakes near Tokyo. I'm wondering if these are pre-shocks to something a little bigger
 

Tsunami

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Cleveland SE QLD
Of interest. A masive earthquake has been predicted for nz alpine fault. June 18 at 11.32am.
Now Nostradamus has a prediction of a great earthquake on cascadia fault near Vancouva usa between 18th June 2020 and 12th july due to planet alignment. Interesting same dates

If we believe that stuff or not it will be very interesting to watch and hope neither eventuate.

https://future.fandom.com/wiki/2020_New_Zealand_Earthquake
 

Bello Weather

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Of interest. A masive earthquake has been predicted for nz alpine fault. June 18 at 11.32am.
Now Nostradamus has a prediction of a great earthquake on cascadia fault near Vancouva usa between 18th June 2020 and 12th july due to planet alignment. Interesting same dates

If we believe that stuff or not it will be very interesting to watch and hope neither eventuate.

https://future.fandom.com/wiki/2020_New_Zealand_Earthquake

Was sounding very convincing until I read this bit: "Many bridges and roads will be damaged or completely destroyed, and tsunamis up to 30m high will occur in Milford Sound, where over 500 people will die when tour boats, loaded with passengers from the United States and France, will be destroyed." I dont see myself as someone able to predict the future, but even I reckon that there is a pretty good chance that we won't find boats full of people from the US and France in NZ any time soon...
 

Tsunami

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Cleveland SE QLD
Was sounding very convincing until I read this bit: "Many bridges and roads will be damaged or completely destroyed, and tsunamis up to 30m high will occur in Milford Sound, where over 500 people will die when tour boats, loaded with passengers from the United States and France, will be destroyed." I dont see myself as someone able to predict the future, but even I reckon that there is a pretty good chance that we won't find boats full of people from the US and France in NZ any time soon...
Yes i did chuckle about that part
 
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